Chiebot-Mirror
/
grpc
mirror of https://github.com/grpc/grpc.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

Eliminate PingOneLocked() from LB policy API.

Browse Source
pull/16167/head
Mark D. Roth 6 years ago
parent 334d47ee0d
commit f22dc13c5b
5 changed files with 85 additions and 149 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Unified View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 33
      src/core/ext/filters/client_channel/client_channel.cc
  2. 20
      src/core/ext/filters/client_channel/lb_policy.h
  3. 124
      src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.cc
  4. 26
      src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc
  5. 31
      src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc

33
src/core/ext/filters/client_channel/client_channel.cc
Unescape View File

@ -571,15 +571,27 @@ static void start_transport_op_locked(void* arg, grpc_error* error_ignored) {
if (op->send_ping.on_initiate != nullptr || op->send_ping.on_ack != nullptr) { if (op->send_ping.on_initiate != nullptr || op->send_ping.on_ack != nullptr) {
if (chand->lb_policy == nullptr) { if (chand->lb_policy == nullptr) {
GRPC_CLOSURE_SCHED( grpc_error* error =
op->send_ping.on_initiate, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Ping with no load balancing");
GRPC_ERROR_CREATE_FROM_STATIC_STRING("Ping with no load balancing")); GRPC_CLOSURE_SCHED(op->send_ping.on_initiate, GRPC_ERROR_REF(error));
GRPC_CLOSURE_SCHED( GRPC_CLOSURE_SCHED(op->send_ping.on_ack, error);
op->send_ping.on_ack,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("Ping with no load balancing"));
} else { } else {
chand->lb_policy->PingOneLocked(op->send_ping.on_initiate, grpc_error* error = GRPC_ERROR_NONE;
op->send_ping.on_ack); grpc_core::LoadBalancingPolicy::PickState pick_state;
memset(&pick_state, 0, sizeof(pick_state));
// Pick must return synchronously, because pick_state.on_complete is null.
GPR_ASSERT(chand->lb_policy->PickLocked(&pick_state, &error));
if (pick_state.connected_subchannel != nullptr) {
pick_state.connected_subchannel->Ping(op->send_ping.on_initiate,
op->send_ping.on_ack);
} else {
if (error == GRPC_ERROR_NONE) {
error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"LB policy dropped call on ping");
}
GRPC_CLOSURE_SCHED(op->send_ping.on_initiate, GRPC_ERROR_REF(error));
GRPC_CLOSURE_SCHED(op->send_ping.on_ack, error);
}
op->bind_pollset = nullptr; op->bind_pollset = nullptr;
} }
op->send_ping.on_initiate = nullptr; op->send_ping.on_initiate = nullptr;
@ -2684,14 +2696,15 @@ class LbPicker {
grpc_combiner_scheduler(chand->combiner)); grpc_combiner_scheduler(chand->combiner));
calld->pick.on_complete = &calld->pick_closure; calld->pick.on_complete = &calld->pick_closure;
GRPC_CALL_STACK_REF(calld->owning_call, "pick_callback"); GRPC_CALL_STACK_REF(calld->owning_call, "pick_callback");
const bool pick_done = chand->lb_policy->PickLocked(&calld->pick); grpc_error* error = GRPC_ERROR_NONE;
const bool pick_done = chand->lb_policy->PickLocked(&calld->pick, &error);
if (GPR_LIKELY(pick_done)) { if (GPR_LIKELY(pick_done)) {
// Pick completed synchronously. // Pick completed synchronously.
if (grpc_client_channel_trace.enabled()) { if (grpc_client_channel_trace.enabled()) {
gpr_log(GPR_INFO, "chand=%p calld=%p: pick completed synchronously", gpr_log(GPR_INFO, "chand=%p calld=%p: pick completed synchronously",
chand, calld); chand, calld);
} }
pick_done_locked(elem, GRPC_ERROR_NONE); pick_done_locked(elem, error);
GRPC_CALL_STACK_UNREF(calld->owning_call, "pick_callback"); GRPC_CALL_STACK_UNREF(calld->owning_call, "pick_callback");
} else { } else {
// Pick will be returned asynchronously. // Pick will be returned asynchronously.

20
src/core/ext/filters/client_channel/lb_policy.h
Unescape View File

@ -71,6 +71,7 @@ class LoadBalancingPolicy
/// Storage for LB token in \a initial_metadata, or nullptr if not used. /// Storage for LB token in \a initial_metadata, or nullptr if not used.
grpc_linked_mdelem lb_token_mdelem_storage; grpc_linked_mdelem lb_token_mdelem_storage;
/// Closure to run when pick is complete, if not completed synchronously. /// Closure to run when pick is complete, if not completed synchronously.
/// If null, pick will fail if a result is not available synchronously.
grpc_closure* on_complete; grpc_closure* on_complete;
/// Will be set to the selected subchannel, or nullptr on failure or when /// Will be set to the selected subchannel, or nullptr on failure or when
/// the LB policy decides to drop the call. /// the LB policy decides to drop the call.
@ -99,10 +100,15 @@ class LoadBalancingPolicy
/// Finds an appropriate subchannel for a call, based on data in \a pick. /// Finds an appropriate subchannel for a call, based on data in \a pick.
/// \a pick must remain alive until the pick is complete. /// \a pick must remain alive until the pick is complete.
/// ///
/// If the pick succeeds and a result is known immediately, returns true. /// If a result is known immediately, returns true, setting \a *error
/// Otherwise, \a pick->on_complete will be invoked once the pick is /// upon failure. Otherwise, \a pick->on_complete will be invoked once
/// complete with its error argument set to indicate success or failure. /// the pick is complete with its error argument set to indicate success
virtual bool PickLocked(PickState* pick) GRPC_ABSTRACT; /// or failure.
///
/// If \a pick->on_complete is null and no result is known immediately,
/// a synchronous failure will be returned (i.e., \a *error will be
/// set and true will be returned).
virtual bool PickLocked(PickState* pick, grpc_error** error) GRPC_ABSTRACT;
/// Cancels \a pick. /// Cancels \a pick.
/// The \a on_complete callback of the pending pick will be invoked with /// The \a on_complete callback of the pending pick will be invoked with
@ -133,12 +139,6 @@ class LoadBalancingPolicy
virtual void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) virtual void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy)
GRPC_ABSTRACT; GRPC_ABSTRACT;
/// Performs a connected subchannel ping via \a ConnectedSubchannel::Ping()
/// against one of the connected subchannels managed by the policy.
/// Note: This is intended only for use in tests.
virtual void PingOneLocked(grpc_closure* on_initiate,
grpc_closure* on_ack) GRPC_ABSTRACT;
/// Tries to enter a READY connectivity state. /// Tries to enter a READY connectivity state.
/// TODO(roth): As part of restructuring how we handle IDLE state, /// TODO(roth): As part of restructuring how we handle IDLE state,
/// consider whether this method is still needed. /// consider whether this method is still needed.

124
src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.cc
Unescape View File

@ -123,7 +123,7 @@ class GrpcLb : public LoadBalancingPolicy {
GrpcLb(const grpc_lb_addresses* addresses, const Args& args); GrpcLb(const grpc_lb_addresses* addresses, const Args& args);
void UpdateLocked(const grpc_channel_args& args) override; void UpdateLocked(const grpc_channel_args& args) override;
bool PickLocked(PickState* pick) override; bool PickLocked(PickState* pick, grpc_error** error) override;
void CancelPickLocked(PickState* pick, grpc_error* error) override; void CancelPickLocked(PickState* pick, grpc_error* error) override;
void CancelMatchingPicksLocked(uint32_t initial_metadata_flags_mask, void CancelMatchingPicksLocked(uint32_t initial_metadata_flags_mask,
uint32_t initial_metadata_flags_eq, uint32_t initial_metadata_flags_eq,
@ -133,7 +133,6 @@ class GrpcLb : public LoadBalancingPolicy {
grpc_connectivity_state CheckConnectivityLocked( grpc_connectivity_state CheckConnectivityLocked(
grpc_error** connectivity_error) override; grpc_error** connectivity_error) override;
void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) override; void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) override;
void PingOneLocked(grpc_closure* on_initiate, grpc_closure* on_ack) override;
void ExitIdleLocked() override; void ExitIdleLocked() override;
void FillChildRefsForChannelz(ChildRefsList* child_subchannels, void FillChildRefsForChannelz(ChildRefsList* child_subchannels,
ChildRefsList* child_channels) override; ChildRefsList* child_channels) override;
@ -167,13 +166,6 @@ class GrpcLb : public LoadBalancingPolicy {
PendingPick* next = nullptr; PendingPick* next = nullptr;
}; };
/// A linked list of pending pings waiting for the RR policy to be created.
struct PendingPing {
grpc_closure* on_initiate;
grpc_closure* on_ack;
PendingPing* next = nullptr;
};
/// Contains a call to the LB server and all the data related to the call. /// Contains a call to the LB server and all the data related to the call.
class BalancerCallState class BalancerCallState
: public InternallyRefCountedWithTracing<BalancerCallState> { : public InternallyRefCountedWithTracing<BalancerCallState> {
@ -272,14 +264,12 @@ class GrpcLb : public LoadBalancingPolicy {
void AddPendingPick(PendingPick* pp); void AddPendingPick(PendingPick* pp);
static void OnPendingPickComplete(void* arg, grpc_error* error); static void OnPendingPickComplete(void* arg, grpc_error* error);
// Pending ping methods.
void AddPendingPing(grpc_closure* on_initiate, grpc_closure* on_ack);
// Methods for dealing with the RR policy. // Methods for dealing with the RR policy.
void CreateOrUpdateRoundRobinPolicyLocked(); void CreateOrUpdateRoundRobinPolicyLocked();
grpc_channel_args* CreateRoundRobinPolicyArgsLocked(); grpc_channel_args* CreateRoundRobinPolicyArgsLocked();
void CreateRoundRobinPolicyLocked(const Args& args); void CreateRoundRobinPolicyLocked(const Args& args);
bool PickFromRoundRobinPolicyLocked(bool force_async, PendingPick* pp); bool PickFromRoundRobinPolicyLocked(bool force_async, PendingPick* pp,
grpc_error** error);
void UpdateConnectivityStateFromRoundRobinPolicyLocked( void UpdateConnectivityStateFromRoundRobinPolicyLocked(
grpc_error* rr_state_error); grpc_error* rr_state_error);
static void OnRoundRobinConnectivityChangedLocked(void* arg, static void OnRoundRobinConnectivityChangedLocked(void* arg,
@ -342,9 +332,8 @@ class GrpcLb : public LoadBalancingPolicy {
grpc_timer lb_fallback_timer_; grpc_timer lb_fallback_timer_;
grpc_closure lb_on_fallback_; grpc_closure lb_on_fallback_;
// Pending picks and pings that are waiting on the RR policy's connectivity. // Pending picks that are waiting on the RR policy's connectivity.
PendingPick* pending_picks_ = nullptr; PendingPick* pending_picks_ = nullptr;
PendingPing* pending_pings_ = nullptr;
// The RR policy to use for the backends. // The RR policy to use for the backends.
OrphanablePtr<LoadBalancingPolicy> rr_policy_; OrphanablePtr<LoadBalancingPolicy> rr_policy_;
@ -1080,7 +1069,6 @@ GrpcLb::GrpcLb(const grpc_lb_addresses* addresses,
GrpcLb::~GrpcLb() { GrpcLb::~GrpcLb() {
GPR_ASSERT(pending_picks_ == nullptr); GPR_ASSERT(pending_picks_ == nullptr);
GPR_ASSERT(pending_pings_ == nullptr);
gpr_mu_destroy(&lb_channel_mu_); gpr_mu_destroy(&lb_channel_mu_);
gpr_free((void*)server_name_); gpr_free((void*)server_name_);
grpc_channel_args_destroy(args_); grpc_channel_args_destroy(args_);
@ -1126,14 +1114,6 @@ void GrpcLb::ShutdownLocked() {
// Note: pp is deleted in this callback. // Note: pp is deleted in this callback.
GRPC_CLOSURE_SCHED(&pp->on_complete, GRPC_ERROR_REF(error)); GRPC_CLOSURE_SCHED(&pp->on_complete, GRPC_ERROR_REF(error));
} }
// Clear pending pings.
PendingPing* pping;
while ((pping = pending_pings_) != nullptr) {
pending_pings_ = pping->next;
GRPC_CLOSURE_SCHED(pping->on_initiate, GRPC_ERROR_REF(error));
GRPC_CLOSURE_SCHED(pping->on_ack, GRPC_ERROR_REF(error));
Delete(pping);
}
GRPC_ERROR_UNREF(error); GRPC_ERROR_UNREF(error);
} }
@ -1147,9 +1127,10 @@ void GrpcLb::HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) {
pending_picks_ = pp->next; pending_picks_ = pp->next;
pp->pick->on_complete = pp->original_on_complete; pp->pick->on_complete = pp->original_on_complete;
pp->pick->user_data = nullptr; pp->pick->user_data = nullptr;
if (new_policy->PickLocked(pp->pick)) { grpc_error* error = GRPC_ERROR_NONE;
if (new_policy->PickLocked(pp->pick, &error)) {
// Synchronous return; schedule closure. // Synchronous return; schedule closure.
GRPC_CLOSURE_SCHED(pp->pick->on_complete, GRPC_ERROR_NONE); GRPC_CLOSURE_SCHED(pp->pick->on_complete, error);
} }
Delete(pp); Delete(pp);
} }
@ -1233,58 +1214,37 @@ void GrpcLb::ExitIdleLocked() {
} }
} }
bool GrpcLb::PickLocked(PickState* pick) { bool GrpcLb::PickLocked(PickState* pick, grpc_error** error) {
PendingPick* pp = PendingPickCreate(pick); PendingPick* pp = PendingPickCreate(pick);
bool pick_done = false; bool pick_done = false;
if (rr_policy_ != nullptr) { if (rr_policy_ != nullptr) {
const grpc_connectivity_state rr_connectivity_state = if (grpc_lb_glb_trace.enabled()) {
rr_policy_->CheckConnectivityLocked(nullptr); gpr_log(GPR_INFO, "[grpclb %p] about to PICK from RR %p", this,
// The RR policy may have transitioned to SHUTDOWN but the callback rr_policy_.get());
// registered to capture this event (on_rr_connectivity_changed_) may not }
// have been invoked yet. We need to make sure we aren't trying to pick pick_done =
// from an RR policy instance that's in shutdown. PickFromRoundRobinPolicyLocked(false /* force_async */, pp, error);
if (rr_connectivity_state == GRPC_CHANNEL_SHUTDOWN) { } else { // rr_policy_ == NULL
if (pick->on_complete == nullptr) {
*error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"No pick result available but synchronous result required.");
pick_done = true;
} else {
if (grpc_lb_glb_trace.enabled()) { if (grpc_lb_glb_trace.enabled()) {
gpr_log(GPR_INFO, gpr_log(GPR_INFO,
"[grpclb %p] NOT picking from from RR %p: RR conn state=%s", "[grpclb %p] No RR policy. Adding to grpclb's pending picks",
this, rr_policy_.get(), this);
grpc_connectivity_state_name(rr_connectivity_state));
} }
AddPendingPick(pp); AddPendingPick(pp);
pick_done = false; if (!started_picking_) {
} else { // RR not in shutdown StartPickingLocked();
if (grpc_lb_glb_trace.enabled()) {
gpr_log(GPR_INFO, "[grpclb %p] about to PICK from RR %p", this,
rr_policy_.get());
} }
pick_done = PickFromRoundRobinPolicyLocked(false /* force_async */, pp); pick_done = false;
}
} else { // rr_policy_ == NULL
if (grpc_lb_glb_trace.enabled()) {
gpr_log(GPR_INFO,
"[grpclb %p] No RR policy. Adding to grpclb's pending picks",
this);
}
AddPendingPick(pp);
if (!started_picking_) {
StartPickingLocked();
} }
pick_done = false;
} }
return pick_done; return pick_done;
} }
void GrpcLb::PingOneLocked(grpc_closure* on_initiate, grpc_closure* on_ack) {
if (rr_policy_ != nullptr) {
rr_policy_->PingOneLocked(on_initiate, on_ack);
} else {
AddPendingPing(on_initiate, on_ack);
if (!started_picking_) {
StartPickingLocked();
}
}
}
void GrpcLb::FillChildRefsForChannelz(ChildRefsList* child_subchannels, void GrpcLb::FillChildRefsForChannelz(ChildRefsList* child_subchannels,
ChildRefsList* child_channels) { ChildRefsList* child_channels) {
// delegate to the RoundRobin to fill the children subchannels. // delegate to the RoundRobin to fill the children subchannels.
@ -1598,18 +1558,6 @@ void GrpcLb::AddPendingPick(PendingPick* pp) {
pending_picks_ = pp; pending_picks_ = pp;
} }
//
// PendingPing
//
void GrpcLb::AddPendingPing(grpc_closure* on_initiate, grpc_closure* on_ack) {
PendingPing* pping = New<PendingPing>();
pping->on_initiate = on_initiate;
pping->on_ack = on_ack;
pping->next = pending_pings_;
pending_pings_ = pping;
}
// //
// code for interacting with the RR policy // code for interacting with the RR policy
// //
@ -1619,7 +1567,8 @@ void GrpcLb::AddPendingPing(grpc_closure* on_initiate, grpc_closure* on_ack) {
// cleanups this callback would otherwise be responsible for. // cleanups this callback would otherwise be responsible for.
// If \a force_async is true, then we will manually schedule the // If \a force_async is true, then we will manually schedule the
// completion callback even if the pick is available immediately. // completion callback even if the pick is available immediately.
bool GrpcLb::PickFromRoundRobinPolicyLocked(bool force_async, PendingPick* pp) { bool GrpcLb::PickFromRoundRobinPolicyLocked(bool force_async, PendingPick* pp,
grpc_error** error) {
// Check for drops if we are not using fallback backend addresses. // Check for drops if we are not using fallback backend addresses.
if (serverlist_ != nullptr) { if (serverlist_ != nullptr) {
// Look at the index into the serverlist to see if we should drop this call. // Look at the index into the serverlist to see if we should drop this call.
@ -1653,11 +1602,12 @@ bool GrpcLb::PickFromRoundRobinPolicyLocked(bool force_async, PendingPick* pp) {
GPR_ASSERT(pp->pick->user_data == nullptr); GPR_ASSERT(pp->pick->user_data == nullptr);
pp->pick->user_data = (void**)&pp->lb_token; pp->pick->user_data = (void**)&pp->lb_token;
// Pick via the RR policy. // Pick via the RR policy.
bool pick_done = rr_policy_->PickLocked(pp->pick); bool pick_done = rr_policy_->PickLocked(pp->pick, error);
if (pick_done) { if (pick_done) {
PendingPickSetMetadataAndContext(pp); PendingPickSetMetadataAndContext(pp);
if (force_async) { if (force_async) {
GRPC_CLOSURE_SCHED(pp->original_on_complete, GRPC_ERROR_NONE); GRPC_CLOSURE_SCHED(pp->original_on_complete, *error);
*error = GRPC_ERROR_NONE;
pick_done = false; pick_done = false;
} }
Delete(pp); Delete(pp);
@ -1709,18 +1659,8 @@ void GrpcLb::CreateRoundRobinPolicyLocked(const Args& args) {
"[grpclb %p] Pending pick about to (async) PICK from RR %p", this, "[grpclb %p] Pending pick about to (async) PICK from RR %p", this,
rr_policy_.get()); rr_policy_.get());
} }
PickFromRoundRobinPolicyLocked(true /* force_async */, pp); grpc_error* error = GRPC_ERROR_NONE;
} PickFromRoundRobinPolicyLocked(true /* force_async */, pp, &error);
// Send pending pings to RR policy.
PendingPing* pping;
while ((pping = pending_pings_)) {
pending_pings_ = pping->next;
if (grpc_lb_glb_trace.enabled()) {
gpr_log(GPR_INFO, "[grpclb %p] Pending ping about to PING from RR %p",
this, rr_policy_.get());
}
rr_policy_->PingOneLocked(pping->on_initiate, pping->on_ack);
Delete(pping);
} }
} }

26
src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc
Unescape View File

@ -46,7 +46,7 @@ class PickFirst : public LoadBalancingPolicy {
explicit PickFirst(const Args& args); explicit PickFirst(const Args& args);
void UpdateLocked(const grpc_channel_args& args) override; void UpdateLocked(const grpc_channel_args& args) override;
bool PickLocked(PickState* pick) override; bool PickLocked(PickState* pick, grpc_error** error) override;
void CancelPickLocked(PickState* pick, grpc_error* error) override; void CancelPickLocked(PickState* pick, grpc_error* error) override;
void CancelMatchingPicksLocked(uint32_t initial_metadata_flags_mask, void CancelMatchingPicksLocked(uint32_t initial_metadata_flags_mask,
uint32_t initial_metadata_flags_eq, uint32_t initial_metadata_flags_eq,
@ -56,7 +56,6 @@ class PickFirst : public LoadBalancingPolicy {
grpc_connectivity_state CheckConnectivityLocked( grpc_connectivity_state CheckConnectivityLocked(
grpc_error** connectivity_error) override; grpc_error** connectivity_error) override;
void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) override; void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) override;
void PingOneLocked(grpc_closure* on_initiate, grpc_closure* on_ack) override;
void ExitIdleLocked() override; void ExitIdleLocked() override;
void FillChildRefsForChannelz(ChildRefsList* child_subchannels, void FillChildRefsForChannelz(ChildRefsList* child_subchannels,
ChildRefsList* ignored) override; ChildRefsList* ignored) override;
@ -173,9 +172,10 @@ void PickFirst::HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) {
PickState* pick; PickState* pick;
while ((pick = pending_picks_) != nullptr) { while ((pick = pending_picks_) != nullptr) {
pending_picks_ = pick->next; pending_picks_ = pick->next;
if (new_policy->PickLocked(pick)) { grpc_error* error = GRPC_ERROR_NONE;
if (new_policy->PickLocked(pick, &error)) {
// Synchronous return, schedule closure. // Synchronous return, schedule closure.
GRPC_CLOSURE_SCHED(pick->on_complete, GRPC_ERROR_NONE); GRPC_CLOSURE_SCHED(pick->on_complete, error);
} }
} }
} }
@ -259,13 +259,18 @@ void PickFirst::ExitIdleLocked() {
} }
} }
bool PickFirst::PickLocked(PickState* pick) { bool PickFirst::PickLocked(PickState* pick, grpc_error** error) {
// If we have a selected subchannel already, return synchronously. // If we have a selected subchannel already, return synchronously.
if (selected_ != nullptr) { if (selected_ != nullptr) {
pick->connected_subchannel = selected_->connected_subchannel()->Ref(); pick->connected_subchannel = selected_->connected_subchannel()->Ref();
return true; return true;
} }
// No subchannel selected yet, so handle asynchronously. // No subchannel selected yet, so handle asynchronously.
if (pick->on_complete == nullptr) {
*error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"No pick result available but synchronous result required.");
return true;
}
if (!started_picking_) { if (!started_picking_) {
StartPickingLocked(); StartPickingLocked();
} }
@ -293,17 +298,6 @@ void PickFirst::NotifyOnStateChangeLocked(grpc_connectivity_state* current,
notify); notify);
} }
void PickFirst::PingOneLocked(grpc_closure* on_initiate, grpc_closure* on_ack) {
if (selected_ != nullptr) {
selected_->connected_subchannel()->Ping(on_initiate, on_ack);
} else {
GRPC_CLOSURE_SCHED(on_initiate,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("Not connected"));
GRPC_CLOSURE_SCHED(on_ack,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("Not connected"));
}
}
void PickFirst::FillChildRefsForChannelz( void PickFirst::FillChildRefsForChannelz(
ChildRefsList* child_subchannels_to_fill, ChildRefsList* ignored) { ChildRefsList* child_subchannels_to_fill, ChildRefsList* ignored) {
mu_guard guard(&child_refs_mu_); mu_guard guard(&child_refs_mu_);

31
src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc
Unescape View File

@ -57,7 +57,7 @@ class RoundRobin : public LoadBalancingPolicy {
explicit RoundRobin(const Args& args); explicit RoundRobin(const Args& args);
void UpdateLocked(const grpc_channel_args& args) override; void UpdateLocked(const grpc_channel_args& args) override;
bool PickLocked(PickState* pick) override; bool PickLocked(PickState* pick, grpc_error** error) override;
void CancelPickLocked(PickState* pick, grpc_error* error) override; void CancelPickLocked(PickState* pick, grpc_error* error) override;
void CancelMatchingPicksLocked(uint32_t initial_metadata_flags_mask, void CancelMatchingPicksLocked(uint32_t initial_metadata_flags_mask,
uint32_t initial_metadata_flags_eq, uint32_t initial_metadata_flags_eq,
@ -67,7 +67,6 @@ class RoundRobin : public LoadBalancingPolicy {
grpc_connectivity_state CheckConnectivityLocked( grpc_connectivity_state CheckConnectivityLocked(
grpc_error** connectivity_error) override; grpc_error** connectivity_error) override;
void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) override; void HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) override;
void PingOneLocked(grpc_closure* on_initiate, grpc_closure* on_ack) override;
void ExitIdleLocked() override; void ExitIdleLocked() override;
void FillChildRefsForChannelz(ChildRefsList* child_subchannels, void FillChildRefsForChannelz(ChildRefsList* child_subchannels,
ChildRefsList* ignored) override; ChildRefsList* ignored) override;
@ -253,9 +252,10 @@ void RoundRobin::HandOffPendingPicksLocked(LoadBalancingPolicy* new_policy) {
PickState* pick; PickState* pick;
while ((pick = pending_picks_) != nullptr) { while ((pick = pending_picks_) != nullptr) {
pending_picks_ = pick->next; pending_picks_ = pick->next;
if (new_policy->PickLocked(pick)) { grpc_error* error = GRPC_ERROR_NONE;
if (new_policy->PickLocked(pick, &error)) {
// Synchronous return, schedule closure. // Synchronous return, schedule closure.
GRPC_CLOSURE_SCHED(pick->on_complete, GRPC_ERROR_NONE); GRPC_CLOSURE_SCHED(pick->on_complete, error);
} }
} }
} }
@ -368,7 +368,7 @@ void RoundRobin::DrainPendingPicksLocked() {
} }
} }
bool RoundRobin::PickLocked(PickState* pick) { bool RoundRobin::PickLocked(PickState* pick, grpc_error** error) {
if (grpc_lb_round_robin_trace.enabled()) { if (grpc_lb_round_robin_trace.enabled()) {
gpr_log(GPR_INFO, "[RR %p] Trying to pick (shutdown: %d)", this, shutdown_); gpr_log(GPR_INFO, "[RR %p] Trying to pick (shutdown: %d)", this, shutdown_);
} }
@ -376,6 +376,11 @@ bool RoundRobin::PickLocked(PickState* pick) {
if (subchannel_list_ != nullptr) { if (subchannel_list_ != nullptr) {
if (DoPickLocked(pick)) return true; if (DoPickLocked(pick)) return true;
} }
if (pick->on_complete == nullptr) {
*error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"No pick result available but synchronous result required.");
return true;
}
/* no pick currently available. Save for later in list of pending picks */ /* no pick currently available. Save for later in list of pending picks */
pick->next = pending_picks_; pick->next = pending_picks_;
pending_picks_ = pick; pending_picks_ = pick;
@ -647,22 +652,6 @@ void RoundRobin::NotifyOnStateChangeLocked(grpc_connectivity_state* current,
notify); notify);
} }
void RoundRobin::PingOneLocked(grpc_closure* on_initiate,
grpc_closure* on_ack) {
const size_t next_ready_index =
subchannel_list_->GetNextReadySubchannelIndexLocked();
if (next_ready_index < subchannel_list_->num_subchannels()) {
RoundRobinSubchannelData* selected =
subchannel_list_->subchannel(next_ready_index);
selected->connected_subchannel()->Ping(on_initiate, on_ack);
} else {
GRPC_CLOSURE_SCHED(on_initiate, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"Round Robin not connected"));
GRPC_CLOSURE_SCHED(on_ack, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
"Round Robin not connected"));
}
}
void RoundRobin::UpdateLocked(const grpc_channel_args& args) { void RoundRobin::UpdateLocked(const grpc_channel_args& args) {
const grpc_arg* arg = grpc_channel_args_find(&args, GRPC_ARG_LB_ADDRESSES); const grpc_arg* arg = grpc_channel_args_find(&args, GRPC_ARG_LB_ADDRESSES);
AutoChildRefsUpdater guard(this); AutoChildRefsUpdater guard(this);

Write Preview
Loading…
Cancel
Save